GM 2 Digit codes for 82 and up (non OBD-II)

GARD Pro Not Registered
code code definition
12 diagnostic mode
13 02 sensor or circuit
14 coolant sensor or circuit/ high temp indicated
15 coolant sensor or circuit/ low temp indicated
16 system voltage out of range
19 crankshaft position sensor or circuit
21 throttle position sensor or circuit- voltage high
22 throttle position sensor or circuit- voltage low
23 mixture control (m/c) solenoid or circuit (carbureted models)
23 manifold air temperature (mat) sensor or circuit (1990 and earlier models) 23- intake air temperature (iat) sensor circuit (fuel-injected models)
24 vehicle speed sensor (vss) or circuit
25 manifold air temperature (mat) sensor or circuit – high temperature indicated (1990 and earlier models)
25 intake air temperature (iat) sensor or circuit – high temperature indicated (1991 and later models)
26 quad driver module circuit
27 quad driver module circuit
28 quad driver module circuit
29 quad driver module circuit
31 park/neutral position (pnp) switch circuit
32 baro sensor or circuit (carbureted models)
32 egr circuit (fuel-injected models)
33 manifold absolute pressure (map sensor signal voltage high
33 mass air flow (maf) sensor or circuit – excessive airflow indicated
34 manifold absolute pressure (map) sensor signal voltage low
34 mass air flow (maf) sensor signal – low airflow indicated
35 idle speed control (isc) switch or circuit (shorted) (carbureted models)
35 idle air control (iac) valve/ circuit
38 brake switch circuit
39 torque converter clutch (tcc) circuit
41 no distributor signals to ecm, or faulty ignition module ( carbed models)
41 cylinders select error- mem-cal or ecm problem ( fuel-injected models
41 cam sensor circuit (3.8 engine)
42 bypass or electronic spark timing (est) circuit
43 low voltage at ecm terminal l (carbureted models)
43 knock sensor circuit
44 oxygen sensor or circuit – lean exhaust detected
45 oxygen sensor or circuit – rich exhaust detected
46 power steering pressure switch circuit
48 misfire diagnosis
51 prom, mem-cal or ecm problem
52 calpak or ecm problem
53 egr fault (carbureted models only)
53 system over-voltage (ecm over 17.7 volts)
54 mixture control (m/c) solenoid or circuit (carbureted models)
54 fuel pump circuit (1986 and later models)
55 oxygen sensor circuit or ecm
55 fuel lean monitor (2.2l engine)
61 oxygen sensor signal faulty (possible contaminated sensor)
62 transaxle gear switch signal circuits
63 manifold absolute pressure (map) sensor voltage high (low vacuum detected)
64 manifold absolute pressure (map) sensor voltage low (high vacuum detected)
66 pressure sensor or circuit air conditioning

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